"Sorry, no response was returned." for no apparent reason with Claude Sonnet 4

[BSoDium]

Hi! I keep getting the "Sorry, no response was returned." error when using agent mode in Github Copilot Chat, with Claude Sonnet 4 selected. Screenshot attached below. This usually happens halfway through the response, and never lets the model finish working.

Clicking "Try again" does not appear to fix the issue, it leads to the same exact issue a couple seconds later.

[vs-code-engineering]

Please look at the following meta issue: #253126. Please refer to that issue for updates and discussions. Feel free to open a new issue if you think this is a different problem.

[BSoDium]

Good bot